Influência das propriedades físicas de graviola e aditivos na secagem em leito de jorro com alimentação intermitente
The objective of this work was to analyze the influence of physical properties of formulated mixtures of soursop pulp with milk or albumin and the operating conditions, concentration and temperature, on the definition of mathematical equations describing the phenomena of spouted bed drying. Macro...
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| Formato: | doctoralThesis |
| Idioma: | por |
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Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/25449 |
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| Resumo: | The objective of this work was to analyze the influence of physical properties of formulated
mixtures of soursop pulp with milk or albumin and the operating conditions, concentration
and temperature, on the definition of mathematical equations describing the phenomena of
spouted bed drying. Macroscopic heat and mass balances were written, describing the powder
production and the drying behavior of soursop pulp/milk or soursop pulp/albumin in spouted
bed with intermittent feeding and high-density polyethylene or polypropylene as inert
particles. The drying tests were carried out following 2² factorial plannings with 3 repetitions
at the central point. The following independent variables were considered: inlet air
temperature (60 - 80ºC) and milk or albumin concentrations (30 - 50%). From the physical
properties of the mixtures, the models that represent the flow of powder as function of time
were determined. Considering suspension accumulation inside the device, a model was
developed to evaluate the temperature of the air at the dryer outlet. The results obtained with
mathematical modelling were compared with experimental data, indicating that the model fits
the process well, and gives reasonable values for outlet air temperature and mass of powder
recovered. |
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